From 6d9d80362f9932bbc87e162b8ef7df06c73e27e1 Mon Sep 17 00:00:00 2001
From: Xavier Del Campo Romero <xavi.dcr@tutanota.com>
Date: Sat, 7 Sep 2024 00:04:38 +0200
Subject: First commit

---
 src/routines/section/export.c | 123 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 src/routines/section/export.c

(limited to 'src/routines/section/export.c')

diff --git a/src/routines/section/export.c b/src/routines/section/export.c
new file mode 100644
index 0000000..643b55f
--- /dev/null
+++ b/src/routines/section/export.c
@@ -0,0 +1,123 @@
+/*
+ * nanowasm, a tiny WebAssembly/Wasm interpreter
+ * Copyright (C) 2023-2025  Xavier Del Campo Romero
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include <nanowasm/nw.h>
+#include <nw/interp.h>
+#include <nw/io.h>
+#include <nw/log.h>
+#include <nw/routines.h>
+
+static enum nw_state entry_loop(struct nw_mod *m);
+
+static enum nw_state get_index(struct nw_mod *const m)
+{
+    nw_varuint32 index;
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    struct nw_sm_exp *const e = &m->sm.export;
+    struct nw_sm_leb128 *const l = &e->leb128;
+    const enum nw_state n = nwp_varuint32(cfg, l, &index, cfg->user);
+
+    if (n)
+        return n;
+
+    e->entry_i++;
+    m->next = entry_loop;
+    return NW_AGAIN;
+}
+
+static enum nw_state get_kind(struct nw_mod *const m)
+{
+    unsigned char kind;
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    struct nw_sm_io io = {0};
+    enum nw_state n;
+
+    io.buf = &kind;
+    io.n = sizeof kind;
+
+    if ((n = nwp_io_read(cfg, &io, cfg->user)))
+        return n;
+
+    /* TODO: check kind */
+    m->next = get_index;
+    return NW_AGAIN;
+}
+
+static enum nw_state get_name(struct nw_mod *const m)
+{
+    unsigned char b;
+    struct nw_sm_exp *const e = &m->sm.export;
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    struct nw_sm_io io = {0};
+    enum nw_state n;
+
+    io.buf = &b;
+    io.n = sizeof b;
+
+    if ((n = nwp_io_read(cfg, &io, cfg->user)))
+        return n;
+    else if (++e->len_i >= e->field_len)
+    {
+        e->len_i = 0;
+        m->next = get_kind;
+    }
+
+    return NW_AGAIN;
+}
+
+static enum nw_state get_len(struct nw_mod *const m)
+{
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    struct nw_sm_exp *const e = &m->sm.export;
+    struct nw_sm_leb128 *const l = &e->leb128;
+    const enum nw_state n = nwp_varuint32(cfg, l, &e->field_len, cfg->user);
+
+    if (n)
+        return n;
+    else if (!e->field_len)
+    {
+#ifdef NW_LOG
+        nwp_log("invalid field length\n");
+#endif
+        return NW_FATAL;
+    }
+
+    m->next = get_name;
+    return NW_AGAIN;
+}
+
+static enum nw_state entry_loop(struct nw_mod *const m)
+{
+    const struct nw_sm_exp *const e = &m->sm.export;
+
+    m->next = e->entry_i < e->count ? get_len : nwp_section_exit;
+    return NW_AGAIN;
+}
+
+static enum nw_state get_count(struct nw_mod *const m)
+{
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    struct nw_sm_exp *const e = &m->sm.export;
+    struct nw_sm_leb128 *const l = &e->leb128;
+    const enum nw_state n = nwp_varuint32(cfg, l, &e->count, cfg->user);
+
+    if (n)
+        return n;
+
+    m->next = entry_loop;
+    return NW_AGAIN;
+}
+
+void nwp_section_export(struct nw_mod *const m)
+{
+    const struct nw_sm_exp e = {0};
+
+    m->sm.export = e;
+    m->next = get_count;
+}
-- 
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